//package com.filter;
//
//
//import com.fasterxml.jackson.databind.ObjectMapper;
//import com.shiro.*;
//
//import com.shiro.token.JWTToken;
//import com.utils.JWTUtils;
//import lombok.extern.slf4j.Slf4j;
//import org.apache.shiro.SecurityUtils;
//import org.apache.shiro.ShiroException;
//import org.apache.shiro.authc.ExpiredCredentialsException;
//import org.apache.shiro.web.filter.authc.BasicHttpAuthenticationFilter;
//import org.apache.shiro.web.util.WebUtils;
//import org.springframework.http.HttpStatus;
//import org.springframework.web.bind.annotation.RequestMethod;
//
//import javax.servlet.ServletRequest;
//import javax.servlet.ServletResponse;
//import javax.servlet.http.HttpServletRequest;
//import javax.servlet.http.HttpServletResponse;
//import java.io.IOException;
//
///**
// * @author WxrStart
// * @create 2022-05-23 23:18
// */
//import java.io.PrintWriter;
//import java.net.URLEncoder;
//
//import javax.servlet.ServletRequest;
//import javax.servlet.ServletResponse;
//import javax.servlet.http.HttpServletRequest;
//import javax.servlet.http.HttpServletResponse;
//
//import org.apache.shiro.authc.AuthenticationException;
//import org.apache.shiro.authc.AuthenticationToken;
//import org.apache.shiro.subject.Subject;
//import org.apache.shiro.web.filter.authc.BasicHttpAuthenticationFilter;
//import org.apache.shiro.web.util.WebUtils;
//import org.slf4j.Logger;
//import org.slf4j.LoggerFactory;
//import org.springframework.http.HttpStatus;
//import org.springframework.web.bind.annotation.RequestMethod;
//import sun.awt.windows.WWindowPeer;
//
///**
// *
// * 根据ShiroConfig中FilterChainDefinitionMap的配置的某些路径会被jwtFilter 过滤器拦截。jwtFilter
// * 先检查请求头中是否包含 JWT token，若不包含直接拒绝访问。反之，jwtFilter 会将请求头中包含的 JWT token 封装成 JwtToken 对象，并调用 subject.login(token) 方法交给Shiro去进行登录判断。
// */
//@Slf4j
//public class JwtFilter extends BasicHttpAuthenticationFilter {
//
//
//    /**
//     * 前置处理
//     */
//    @Override
//    protected boolean preHandle(ServletRequest request, ServletResponse response) throws Exception {
//        log.info("JwtFilter的preHandle调用了");
//        HttpServletRequest httpServletRequest = (HttpServletRequest) request;
//        HttpServletResponse httpServletResponse = (HttpServletResponse) response;
//        httpServletResponse.setHeader("Access-control-Allow-Origin", httpServletRequest.getHeader("Origin")); //标识允许哪个域到请求，直接修改成请求头的域
//        httpServletResponse.setHeader("Access-Control-Allow-Methods", "GET,POST,OPTIONS,PUT,DELETE");//标识允许的请求方法
//        // 响应首部 Access-Control-Allow-Headers 用于 preflight request （预检请求）中，列出了将会在正式请求的 Access-Control-Expose-Headers 字段中出现的首部信息。修改为请求首部
//        httpServletResponse.setHeader("Access-Control-Allow-Headers", httpServletRequest.getHeader("Access-Control-Request-Headers"));
//        //给option请求直接返回正常状态
//        if (httpServletRequest.getMethod().equals(RequestMethod.OPTIONS.name())) {
//            httpServletResponse.setStatus(HttpStatus.OK.value());
//            return false;
//        }
//        return super.preHandle(request, response);
//    }
//
//    /**
//     * 后置处理
//     */
//    @Override
//    protected void postHandle(ServletRequest request, ServletResponse response) {
//        log.info("JwtFilter的postHandle调用了");
//        // 添加跨域支持
//        this.fillCorsHeader(WebUtils.toHttp(request), WebUtils.toHttp(response));
//    }
//
//    /**
//     * 过滤器拦截请求的入口方法
//     * 返回 true 则允许访问
//     * 返回false 则禁止访问，会进入 onAccessDenied()
//     */
//    @Override
//    protected boolean isAccessAllowed(ServletRequest request, ServletResponse response, Object mappedValue) {
//        log.info("JwtFilter的isAccessAllowed调用了");
//        boolean allowed = false;
//        // 检测Header里的 JWT token内容是否正确，尝试使用 token进行登录
//        try {
//            allowed = executeLogin(request, response);
//        } catch (NullPointerException e){
//            responseError(response,401,"未找到jwt");
//            return false;
//        }
//        return allowed || super.isPermissive(mappedValue);
//    }
//
//
//    /**
//     * 身份验证,检查 JWT token 是否合法
//     */
//    @Override
//    protected boolean executeLogin(ServletRequest request, ServletResponse response)  {
//        HttpServletRequest httpServletRequest = (HttpServletRequest) request;
//        String token = httpServletRequest.getHeader("x-access-token");
//        JWTToken jwtToken = new JWTToken(token);
//        // 提交给realm进行登入，如果错误他会抛出异常并被捕获
//        try {
//            getSubject(request, response).login(jwtToken);
//        } catch (AuthenticationException e) {
//            responseError(response,401,e.getMessage());
//            return false;
//        }
//        // 如果没有抛出异常则代表登入成功，返回true
//        return true;
//    }
//
//
//
//
//
//    /**
//     * Shiro 利用 JWT token 登录成功，会进入该方法
//     */
//    @Override
//    protected boolean onLoginSuccess(AuthenticationToken token, Subject subject, ServletRequest request,
//                                     ServletResponse response) throws Exception {
//        log.info("JwtFilter的onLoginSuccess调用了");
//        HttpServletResponse httpResponse = WebUtils.toHttp(response);
//        String newToken = null;
//        if (token instanceof JWTToken) {
//            //刷新jwt token
//            newToken = JWTUtils.refreshTokenExpired(token.getCredentials().toString(), JWTUtils.SECRET);
//        }
//        if (newToken != null)
//            httpResponse.setHeader(JWTUtils.AUTH_HEADER, newToken);
//        return true;
//    }
//
//    /**
//     * Shiro 利用 JWT token 登录失败，会进入该方法
//     */
//    @Override
//    protected boolean onLoginFailure(AuthenticationToken token, AuthenticationException e, ServletRequest request,
//                                     ServletResponse response) {
//        log.info("JwtFilter的onLoginFailure调用了");
//        // 此处直接返回 false ，交给后面的  onAccessDenied()方法进行处理
//        return false;
//    }
//
//    /**
//     * 添加跨域支持
//     */
//    protected void fillCorsHeader(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) {
//        log.info("JwtFilter的fillCorsHeader调用了");
//        httpServletResponse.setHeader("Access-control-Allow-Origin", httpServletRequest.getHeader("Origin"));
//        httpServletResponse.setHeader("Access-Control-Allow-Methods", "GET,POST,OPTIONS,HEAD");
//        httpServletResponse.setHeader("Access-Control-Allow-Headers",
//                httpServletRequest.getHeader("Access-Control-Request-Headers"));
//    }
//
//    /**
//     * 将非法请求跳转到 /filterErroControllerr/**中
//     */
//    private void responseError(ServletResponse response, int code,String message) {
//        try {
//            HttpServletResponse httpServletResponse = (HttpServletResponse) response;
//            //设置编码，否则中文字符在重定向时会变为空字符串
//            message = URLEncoder.encode(message, "UTF-8");
//            //如果有项目名称路径记得加上
//            httpServletResponse.sendRedirect("/filterError/" + code + "/" + message);
//
//        } catch (IOException e1) {
//            log.error(e1.getMessage());
//        }
//    }
//
//
//
//}